package filter;

import cn.edu.ahtcm.bean.User;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebFilter("/admin/*")
public class UserFilter implements Filter {

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest httpRequest = (HttpServletRequest)servletRequest;
        HttpServletResponse httpResponse = (HttpServletResponse)servletResponse;
        User user = (User)httpRequest.getSession().getAttribute("user");
        if (user == null){
            httpResponse.sendRedirect("/login.jsp");
        }else{
            filterChain.doFilter(servletRequest, servletResponse);
        }
    }

    @Override
    public void destroy() {

    }
}
